elee24@castle.ed.ac.uk (H Bruce) (09/14/90)
Does anyone know of the existence of 32K by FIFO ? If so could you tell me how much it costs ? If the cost is two high I may consider making one myself. The main components that I think I would need are: 1 32K by 8 static RAM 2 15 bit up/down counters (one for FIFO head, one for tail) 1 15 bit comparator to check that head and tail don't collide. If anyone has any any comments on building FIFO's I would like to hear them. Thanks, Henry Bruce. PS I am an active UNIX and net user that does a lot of work with the 8051 microcontroller family. However there does not appear to be an appropriate newsgroup. Any one interested in setting up comp.sys.8051 ????
emmo@moncam.co.uk (Dave Emmerson) (09/15/90)
In article <6334@castle.ed.ac.uk>, elee24@castle.ed.ac.uk (H Bruce) writes: > Does anyone know of the existence of 32K by FIFO ? > If so could you tell me how much it costs ? > So far as I am aware, the largest device released to date is a 7208 (8k x 9), and that's only in low volume (read : I can't get them) I'm quoted prices around 80 pounds, so if there's a bigger one out, it'll cost you *both* arms & a leg! Also note, I'm often offered good prices on chips which are unobtainable.... They _are_ much nicer to work with than all those counters though :-) Dave.
ftpam1@acad3.fai.alaska.edu (MUNTS PHILLIP A) (09/15/90)
In article <6334@castle.ed.ac.uk>, elee24@castle.ed.ac.uk (H Bruce) writes... >Does anyone know of the existence of 32K by FIFO ? >If so could you tell me how much it costs ? > >If the cost is two high I may consider making one myself. >The main components that I think I would need are: > >1 32K by 8 static RAM >2 15 bit up/down counters (one for FIFO head, one for tail) >1 15 bit comparator to check that head and tail don't collide. > >If anyone has any any comments on building FIFO's I would like to hear them. > The biggest FIFO I have seen data for is the IDT7M206 at 16K by 9. It is a multichip module and will cost big $$$. You could do the same thing yourself with the common .5/1/2/4... K monolithic FIFO's, which have a depth expansion mechanism. (IDT is Integrated Device Technology, 408-727-6116). >Thanks, > >Henry Bruce. > > > >PS I am an active UNIX and net user that does a lot of work with the 8051 > microcontroller family. However there does not appear to be an appropriate > newsgroup. Any one interested in setting up comp.sys.8051 ???? Yes. I work with various sorts of 51 parts and play with the DS5000 from Dallas Semiconductor. Philip Munts N7AHL NRA Extremist, etc. University of Alaska, Fairbanks
markz@ssc.UUCP (Mark Zenier) (09/17/90)
> In article <6334@castle.ed.ac.uk>, elee24@castle.ed.ac.uk (H Bruce) writes... > >Does anyone know of the existence of 32K by FIFO ? > >If so could you tell me how much it costs ? > > > >If the cost is two high I may consider making one myself. > >The main components that I think I would need are: Signetics makes/made a FIFO controller chip. markz@ssc.uucp
cgordon@vpnet.chi.il.us (Gordon Hlavenka) (09/17/90)
>PS I am an active UNIX and net user that does a lot of work with the 8051 > microcontroller family. However there does not appear to be an appropriate > newsgroup. Any one interested in setting up comp.sys.8051 ???? I would vote for that one! Then I'd have to talk the sysadmin into capturing it here... ----------------------------------------------------- Gordon S. Hlavenka cgordon@vpnet.chi.il.us Disclaimer: Yeah, I said it. So what?
josef@nixpbe.UUCP (Moellers) (09/17/90)
In <6334@castle.ed.ac.uk> elee24@castle.ed.ac.uk (H Bruce) writes: >Does anyone know of the existence of 32K by FIFO ? >If so could you tell me how much it costs ? >If the cost is two high I may consider making one myself. >The main components that I think I would need are: >1 32K by 8 static RAM >2 15 bit up/down counters (one for FIFO head, one for tail) >1 15 bit comparator to check that head and tail don't collide. >If anyone has any any comments on building FIFO's I would like to hear them. I have a comment: There is a chip made (at least) by TI (Texas Instruments) that is a FIFO Controller. You add Your memory and voila! I recall that it can manage up to 64KB, but I don't have the manual at hand. -- | Josef Moellers | c/o Nixdorf Computer AG | | USA: mollers.pad@nixdorf.com | Abt. PXD-S14 | | !USA: mollers.pad@nixdorf.de | Heinz-Nixdorf-Ring | | Phone: (+49) 5251 104662 | D-4790 Paderborn |
spp@zabriskie.berkeley.edu (Steve Pope) (09/18/90)
Adaptec makes "circular buffer controller" chips that, combined with RAM, might serve your purpose. AIC-300 is the part number of one such chip. steve pope
bkoball@cup.portal.com (Bruce R Koball) (09/18/90)
re: elee24@castle.ed.ac.uk (H Bruce)'s request for large FIFOs.... check out the Texas Instruments TMS4C1050 1Mbit Pseudo-Static FIFO... uses DRAM type storage cell w/on-chip refresh...256K X 4 organization... also has built in arbitration allowing full word, continuous, async read/write....comes in 50, 30, 25ns access times....one word of caution I haven't used the part myself and the data sheet in the TI 1989 MOS Memory Data Book shows it marked as ADVANCE INFO on new products, but with full timing specs...check with TI Bruce Koball Motion West 2210 Sixth Street Berkeley, CA 94710 415-540-7503 bkoball@cup.portal.com
john@rosevax.Rosemount.COM (John Perkins) (09/20/90)
In article <26f43273-406.1sci.electronics-1@vpnet.chi.il.us> cgordon@vpnet.chi.il.us (Gordon Hlavenka) writes: > >>PS I am an active UNIX and net user that does a lot of work with the 8051 >> microcontroller family. However there does not appear to be an appropriate >> newsgroup. Any one interested in setting up comp.sys.8051 ???? > >I would vote for that one! Then I'd have to talk the sysadmin into >capturing it here... > yes_votes++ ; Sorry, I mean: mov dptr,#yes_votes movx a,@dptr inc a movx @dptr,a jp